CN209570499U - The on-Line Monitor Device of Formaldehyde Determination - Google Patents
The on-Line Monitor Device of Formaldehyde Determination Download PDFInfo
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- CN209570499U CN209570499U CN201920001991.3U CN201920001991U CN209570499U CN 209570499 U CN209570499 U CN 209570499U CN 201920001991 U CN201920001991 U CN 201920001991U CN 209570499 U CN209570499 U CN 209570499U
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Abstract
The utility model discloses a kind of on-Line Monitor Device of Formaldehyde Determination, and sampling module, reaction module, detection module, solution conveyor module, control and data acquisition circuit and display screen are placed in casing；Using glass screw pipe as gaseous formaldehyde collecting trap, 98.5% is up to the arresting efficiency of formaldehyde in air, arresting efficiency is high, small in size, structure is simple, can be outside holding chamber；By the application of the online flow cell of long light path, the sensitivity and detection for improving wet-chemical and the detection of absorption spectroscopy techniques PARA FORMALDEHYDE PRILLS(91,95) are limited；Accurate, stable measurement is ensured by multistage accurately temperature control；Solution flow velocity is accurately controlled by electromagnetic drive micro pump；Wet chemistry method and absorption spectrum detection technique of the present apparatus based on gas diffusion absorption capture realize and carry out real-time online detection to surrounding air kind content of formaldehyde, can content of formaldehyde in live on-line continuous monitoring surrounding air.
Description
Technical field
The utility model belongs to environmental monitoring technology field, is related to ambient air quality on-line monitoring technique, more particularly to
A kind of on-Line Monitor Device of Formaldehyde Determination.
Background technique
Formaldehyde (HCHO) is a kind of compound of high activity, it is not only a kind of atmospheric volatile organic compounds oxidation reaction
Probe material also plays an important role in the photochemical reaction of free radical and ozone.In addition to outside atmosphere, interior is also tended to
It detects that the formaldehyde times over outdoor concentration, human body are exposed to for a long time under the formaldehyde of high concentration, eyes, respiratory tract can be stimulated, after
And cause the symptoms such as headache, nausea, it is serious to induce the cancers such as nasopharyngeal carcinoma, leukaemia.For this purpose, Environmental Protection Agency was from 1991
Start to regard as formaldehyde into human body potential carcinogen, formaldehyde was classified as human body in 2004 and caused by international cancer research institution (IARC)
Cancer object.Therefore, troposphere chemistry can not only preferably be studied by carrying out accurate measurement to Formaldehyde in Atmosphere, and also to publilc health
There is vital effect.
Currently, the monitoring technology of common surrounding air formaldehyde has spectroscopic methodology, mass spectrography and wet chemistry method.Spectroscopic methodology and matter
Spectrometry temporal resolution all with higher, and spectroscopic methodology accuracy is high, but its cost is high, volume is big, maintenance difficult and sensitive
It spends low characteristic and also limits its utilization in terms of formaldehyde determination.Wet chemistry method is because its is at low cost, operation is easy and sensitivity
High advantage becomes the common method of gaseous formaldehyde detection, mainly includes 2,4-dinitrophenylhydrazine method (DNPH) and Hantzsch
Method.DNPH method is the standard method of Atmospheric Formaldehyde measurement, and this method is accurate with measurement result, it is a variety of in atmosphere to measure simultaneously
The advantages of carbonyl compound content, but this method is usually offline inspection, it is more difficult to realize on-line measurement, temporal resolution is lower.
The Formaldehyde analyzer of German Aerolaser company is a kind of formaldehyde on-line detector based on Hantzsch reaction and fluorescence method
Device, although it has many advantages, such as that high sensitivity, selectivity are high and realize that faster on-line checking, this method and instrument are still deposited
Drift, maintenance are easy frequently and the deficiencies of vulnerable to vibration influence in baseline.
Patent " a method of detection air formaldehyde concentration " it is middle using absorbing liquid extraction formaldehyde in air, and pass through third
After ketone inner mark solution reacts with it, using liquid chromatographic detection." instrument for detecting formaldehyde in air " uses test paper reflective colorimetric method
Provide it is a kind of can live fast quantification formaldehyde in air content analysis instrument.Although they realize the quick standard at scene
Really measurement, can not but accomplish the on-line continuous monitoring of formaldehyde.
Patent " the quick formaldehyde testing equipment of low-power consumption " and a kind of " jamproof analyzer for detecting trace formaldehyde in air
Device " then provide formaldehyde determination instrument using electrochemical sensor, but electrochemical sensor exist it is big by the interference of other gases,
The deficiencies of sensor life-time is limited, measurement is inaccurate and measurement concentration range is small.
Utility model content
In order to overcome the above-mentioned deficiencies of the prior art, the utility model provides a kind of the online of Formaldehyde Determination
Monitoring device, wet chemistry method and absorption spectrum detection technique of the device based on gas diffusion absorption capture are realized to environment sky
Gas kind content of formaldehyde carries out real-time online detection, can content of formaldehyde in live on-line continuous monitoring surrounding air.
The principles of the present invention are: the utility model is provided to be existed using wet type gas diffusion trapping principle and long light path
The surrounding air formaldehyde on-Line Monitor Device of line circulation pool technology, sampling module, reaction module, detection module, solution convey mould
Block, control and data acquisition circuit and display screen are placed in casing；Using electromagnetic drive micro pump, micro solution is carried out
It is precisely controlled, and reduces daily maintenance, realize quick, the online and continuous measurement of low concentration formaldehyde in atmosphere.The utility model
Using combining wet chemistry method and spectroscopic methodology to carry out the on-line monitoring of surrounding air formaldehyde, one is provided for Formaldehyde in Atmosphere on-line measurement
Kind novel measurement technique.In sampling process, air under the action of vacuum diaphragm pump by helix tube collecting trap, absorbing liquid also from
The same end enters helix tube collecting trap, and absorbing liquid forms liquid film in tube wall by liquid tension.Due in helix tube collecting trap
Gas-liquid interface increases, and the gas component of air spreads between interface, mass transfer, comes into full contact with absorption with absorbing liquid.Then in spiral
The other end of pipe collecting trap realizes gas-liquid separation.Derivative liquid using 2,4- pentanedione (acetylacetone,2,4-pentanedione) as formaldehyde, formaldehyde are molten
Derivative reaction occurs under the high temperature conditions and generates yellow compound (3,5- diacetyl -1,4- dihydro two for liquid and acetylacetone,2,4-pentanedione
Picoline (DDL)), it is most strong for the absorption at 415nm in wavelength.Make solution complete using the total reflection online flow cell of long light path
Reflected light is repeatedly absorbed in reflection flow cell, to improve detection sensitivity and detection limit.Absorb component to be measured (formaldehyde)
Liquid phase sample to be tested enters the total reflection online flow cell of long light path after derivative reaction, at this time according to langbobier law,
Under the special light sources irradiation and certain absorber thickness that wavelength is 415nm, the concentration of component to be measured and its absorbance
It is directly proportional.The on-line monitoring of Formaldehyde Determination can be realized according to absorbance.
Technical solution provided by the utility model is:
A kind of on-Line Monitor Device of Formaldehyde Determination, including casing, sampling module, reaction module, detection
Module, solution conveyor module, control and data acquisition circuit and display screen.Wherein, sampling module, reaction module, detection mould
Block, solution conveyor module, control and data acquisition circuit and display screen are placed in casing, and display screen is embedded in casing
On.
The sampling module includes sample lines, except formaldehyde plant, three-way solenoid valve, particulate matter filtering head, helix tube are caught
Collect trap, condensing unit, gas-liquid separation device, drying tube, gas flowmeter and vacuum diaphragm pump.The reaction module includes mixing
Threeway, reaction kettle and air bubble eliminating device.Second electricity of the rear end connection solution conveyor module of the helix tube collecting trap of sampling module
Magnetic driving micro pump, then connected by the mixing tee of reaction module and the reaction kettle of reaction module；The detection module includes
Micropore filtering film, the online flow cell of total reflection long light path, light source, photodetector and insulating box.Reaction kettle is connected to degasification
Bulb apparatus, air bubble eliminating device is connect with the 4th electromagnetic drive micro pump of solution conveyor module, then accesses micropore filtering film, later
Into the online flow cell of total reflection long light path of detection module；The solution conveyor module include four electromagnetic drive micro pumps and
Two peristaltic pumps.Absorbing liquid is connected by the first electromagnetic drive micro pump with sampling module, and the second electromagnetic drive micro pump is by spiral
Pipe collecting trap is connected with the mixing tee of reaction module, and third electromagnetic drive micro pump will derive the mixing three of liquid and reaction module
Logical to be connected, the air bubble eliminating device of reaction module is connected by the 4th electromagnetic drive micro pump with the micropore filtering film of detection module.The
One peristaltic pump is connected with the online flow cell of total reflection long light path in detection module；Gas-liquid in second peristaltic pump and sampling module
Separator rear end is connected.
The control and data acquisition circuit include the main circuit board equipped with USB port, by main circuit board to each module
Temperature is controlled, is controlled solution conveyor module, and acquires and export each module temperature information and detection signal, signal
Data are exported from USB port.Each module temperature, flow, detection signal and formaldehyde content of air are described in display screen display
Control is connected with data acquisition circuit with display screen.Sampling module, will be empty for sampling to the formaldehyde in surrounding air
Formaldehyde in gas is converted into liquid phase sample to be tested；Reaction module makes for dyeing to liquid phase sample to be tested containing formaldehyde
Liquid phase sample to be tested occurs derivative reaction with 2,4- pentanedione under constant high temperature and generates yellow sample to be tested DDL；Detect mould
Block is for detecting light signal strength；Light signal strength by control with data acquisition circuit conversion output be voltage signal data into
Row storage, and show on a display screen.Solution conveyor module dispenses absorbing liquid, derivative liquid and component to be measured for accurate, and defeated
Send cleaning solution and discharge waste liquid.
For the on-Line Monitor Device of above-mentioned Formaldehyde Determination, further:
The casing uses aluminum material, whole to carry out spray process using polytetrafluoro coating, to prevent acid solution corrosion.
Casing set display screen windows and can action pane, wherein described can place micro pump, peristaltic pump, helix tube trapping in action pane
Trap and micropore filtering film, so as to the observation of daily maintenance and measurement process.
In the sampling module, the sample lines use 1/4 " tetrafluoro hard tube, extract air sample using vacuum diaphragm pump
Product are passed through in helix tube collecting trap, while the dilution heat of sulfuric acid of helix tube collecting trap pH=5 is passed through using 1/16 " four fluorine tube
As formaldehyde absorbent.Wherein, core component helix tube collecting trap uses the glass tube of internal diameter 2mm, and turning to diameter is 22mm
Thread-like structure, one end (left end) is the entrance of gas and liquid, and the other end (right end) is gas-liquid separation chamber, integrally uses hard
Glass tube cladding with enhancing structure and provides water-bath interlayer.Meanwhile water-bath interlayer provides water bath with thermostatic control for collecting trap, is stable at
20℃.Collecting trap constant temperature unit has ensured that component to be measured is captured at a constant temperature, and sample caused by temperature change is avoided to catch
Collect efficiency fluctuation；And de-bubble function avoids interference of the bubble to detection.The condensing unit include water circulating pump, cooling piece,
Small-sized water tank, fan, cooling fin and temperature sensor, and will be cold outside water pump, water tank and helix tube collecting trap by silicone tube
Condensate is connected.
In the reaction module, derivative liquid and the solution to be measured for absorbing formaldehyde pass through mixing tee (polytetrafluoro threeway) simultaneously
Into in reaction kettle, derivative reaction occurs under the high temperature conditions and generates yellow substance DDL.Since the reaction is reacted at room temperature
Relatively slowly, the reaction kettle specifically uses length to be coiled on heat-conducting metal cylindrical body for the four fluorine tube of 90cm and is made, built-in
Temperature of reaction kettle is controlled in 75 DEG C to accelerate derivative reaction by heating rod and temperature sensor.
In the detection module, the core of the total reflection online flow cell of long light path includes convex lens, the incision friendship of optical path fluid path
Remittance port, the quartzy capillary column of total reflection, optical path fluid path cut out the modules such as bifurcated port, constant temperature.Light enters optical path after lens
Fluid path cuts the port that crosses, and mixes optical path with fluid path；To reduce dead volume and accelerating the measurement response time, flow cell is using complete
Quartzy capillary column is reflected, length can carry out optimum selecting between 0.5~1.5 meter, by selecting the capillary column of different length can
To obtain different measurement ranges, when length is 1.0 meters, detection is limited to 50pptv, detection range 0-80ppbv.Last light
Road and fluid path cut out the outflow of bifurcated port through optical path fluid path.In order to avoid light source calorific value is larger and frequency spectrum is with temperature fluctuation ratio
More apparent, the light source uses stable LED cool white light source.According to the frequency range feature of LED, selection wavelength is 415nm.It is described to remove
Air bubble apparatus is miniature air bubble eliminating device, using glass material.Temperature not only influences the flow velocity of gas and liquid, the wave of temperature
It is dynamic to be also possible to make the main reason for bubble escapes, is data failure in absorbing liquid, in addition, temperature causes solution variations in refractive index meeting
The absorption of disturbance light.In order to ensure the stability of spectral absorption and staining reaction, the light source and photodetector are placed in great Rong
Aluminum insulating box is measured to keep the temperature stability of detection unit, built-in heating sheet and temperature sensor in the insulating box, temperature
Degree control precision is at ± 0.1 degree.
Four electromagnetic drive micro pumps are for accurately dispensing absorbing liquid, deriving liquid and to be measured group in the solution conveyor module
Point.Two peristaltic pumps are then respectively used to conveying cleaning solution and waste liquid are discharged.
The online of Formaldehyde Determination is realized using the on-Line Monitor Device of above-mentioned Formaldehyde Determination
Monitoring, including following work step:
1) solution is prepared, and dilution heat of sulfuric acid is prepared, as absorbing liquid: 15mL diluting concentrated sulfuric acid is configured to absorb to 5L
Liquid rocks uniformly；5L is diluted to deionized water by 385g ammonium acetate, 12.5mL glacial acetic acid and 10mL acetylacetone,2,4-pentanedione to be configured to spread out
Raw liquid is simultaneously protected from light, cryo-conservation, stands 12 hours.When continuous continual work, the use of the above solution is able to maintain that 6 days.
2) measurement process: measurement process includes the sampling process, reaction process and detection process of formaldehyde.
Sampling process includes obtaining zero gas and sampling environment air；
Using helix tube collecting trap as gaseous pollutant collecting trap, using dilution heat of sulfuric acid as absorbing liquid, sample will be sampled
Formaldehyde in product is converted into liquid phase sample to be tested.When it is implemented, using glass screw pipe collecting trap.
In sampling process, zero gas or surrounding air pass through helix tube collecting trap, absorbing liquid under the action of vacuum diaphragm pump
Also enter helix tube collecting trap from the same end, absorbing liquid forms liquid film in tube wall by liquid tension.Due to being trapped in helix tube
Gas-liquid interface increases in trap, and the gas component of air spreads between interface, mass transfer, comes into full contact with absorption with absorbing liquid.Then exist
The other end of helix tube collecting trap realizes gas-liquid separation.Meanwhile so that sample temperature is stable at 20 DEG C by water bath with thermostatic control, thermostatted water
Bath can effectively avoid the outdoor temperature difference from interfering, and guarantee the stability of sampling process arresting efficiency.To the arresting efficiency of formaldehyde in air
Up to 98.5%.
Reaction process: the derivative liquid of acetylacetone,2,4-pentanedione (2,4- pentanedione) as formaldehyde is used, (liquid phase waits for test sample to formalin
Product) with acetylacetone,2,4-pentanedione occur under the high temperature conditions derivative reaction generate yellow compound (3,5- diacetyl -1,4- dihydro two
Picoline (DDL)), it is most strong for the absorption at 415nm in wavelength.Temperature can regulate and control in reaction process, be initially set 75
DEG C, high temperature accelerates derivative reaction, and stability and detection limit can be improved.It carries out being protected from light design simultaneously, prevents light to reaction
The influence of stability.
Detection process: absorb solution multiple reflections in total reflection flow cell using the total reflection online flow cell of long light path
Light, to improve detection sensitivity and detection limit.The liquid phase sample to be tested of component to be measured (formaldehyde) is absorbed in sampling process, is passed through
After the derivatization of reaction process generates DDL, the total reflection online flow cell of long light path, the characteristic wavelength light quilt that light source generates are entered
Component DDL to be measured absorbs, and light signal strength is examined from the online flow cell optical path outlet of total reflection long light path by photodetector later
Out.The utility model uses the single wavelength light source of 415nm.In addition, the de-bubble function of the total reflection online flow cell front end of long light path
It has been avoided that the interference that bubble detects back-end optical；Meanwhile the temperature constant control of detection process is in 35 DEG C, it is ensured that optical signal
The stability of intensity detection；Available optimum detection is limited to 50pptv.
3) it marks zero process: needing to carry out 30 minutes Zero calibrations before step 2).When marking zero, air is first by removing formaldehyde
Device obtains zero gas, and the light signal strength obtained through step 2) measurement is the light signal strength of zero point.
4) it calibration process: needs to carry out calibration process after the solution that replacement step 1) is prepared every time.
In calibration process, air is first by obtaining zero gas except formaldehyde plant.The light that step 3) obtains zero point is carried out later
Signal strength；The formaldehyde standard solution that absorbing liquid in step 2) is changed into the gradient concentration of laboratory preparation again, to zero gas through step
It is rapid 2) to measure, obtain formaldehyde standard solution light signal strength.
5) content of formaldehyde calculates: step 4) obtains formaldehyde standard solution light signal strength and zero point light signal strength, at this time
According to langbobier law, the concentration of formaldehyde is directly proportional to absorbance, and absorbance is as follows with concentration relationship:
A=Kc formula 2
In formula, A is absorbance, I0For the zero point light signal strength that step 4) obtains, I is that the formaldehyde standard in step 4) is molten
Liquid light signal strength, K are coefficient, and c is the concentration of formaldehyde.According to formula 1 and formula 2, obtained I is measured according to step 4)0, I, and
Know corresponding c (concentration of formaldehyde in formaldehyde standard solution), COEFFICIENT K is calculated.
Using obtained COEFFICIENT K, the light signal strength of certain obtained surrounding air sample, benefit can be measured according to step 2)
The content of formaldehyde in the sample, i.e. liquid phase concentration of formaldehyde are calculated with formula 1 and formula 2.
In addition, liquid phase concentration of formaldehyde need to be scaled to gaseous formaldehyde concentration, as surrounding air concentration of formaldehyde, conversion method
It is as follows:
In formula, P is atmospheric pressure (101kPa), MHCHOFor the molal weight (g/mol) of formaldehyde, R 8.314Pam3·
mol-1·K-1, T is the temperature (unit K) in sampling module in helix tube collecting trap, FlFor flow rate of liquid (0.5mL/min),
FgFor gas flow (0.7L/min), γ being helix tube collecting trap, (the utility model is to the arresting efficiency of air formaldehyde
98.5%).
Compared with prior art, the utility model has the beneficial effects that
The utility model provides a kind of on-Line Monitor Device of Formaldehyde Determination,
Wet chemistry method and absorption spectrum detection technique based on gas diffusion absorption capture are realized to surrounding air kind formaldehyde
Content carries out real-time online detection, can content of formaldehyde in live on-line continuous monitoring surrounding air.
The utility model is the surrounding air formaldehyde on-line monitoring technique of a kind of combination wet chemistry method and spectroscopic methodology, is atmosphere
Middle formaldehyde on-line measurement provides a kind of novel measurement technique means.Compared with prior art, the technical advantage master of the utility model
It is presented as following several respects:
(1) chemical method and optical method are combined, is circulated online using wet type gas diffusion trapping principle and total reflection long light path
Pool technology realizes quick, the online and continuous measurement of low concentration formaldehyde in atmosphere, and response speed is than chemical method faster (when response
Between be 3 minutes, data time resolution ratio is up to second grade), measurement detection limit is higher than optical method, is disturbed degree compared to sensor method
It significantly reduces.
(2) arresting efficiency of formaldehyde in air is up to as gaseous formaldehyde collecting trap using glass screw pipe
98.5%, have that arresting efficiency is high, small in size, structure is simple, can the holding chamber characteristics such as outside.
(3) wet-chemical and absorption spectrum are improved using absorption spectrometry by the application of the online flow cell of long light path
The sensitivity and detection limit of technology PARA FORMALDEHYDE PRILLS(91,95) detection, it is empty to be suitable under a variety of environment (outdoor such as urban district and industrial area, interior)
Online, the continuous monitoring of gas formaldehyde.
(4) accurate, stable measurement is ensured by multistage accurately temperature control.
(5) solution flow velocity is accurately controlled by electromagnetic drive micro pump, reduces daily maintenance and due to peristaltic pump aging
Caused loss of data.
Detailed description of the invention
Fig. 1 is the outside drawing of surrounding air formaldehyde on-Line Monitor Device provided by the embodiment of the utility model；
Fig. 2 is the composite structural diagram of surrounding air formaldehyde on-Line Monitor Device provided by the embodiment of the utility model；
Fig. 3 is the knot of helix tube collecting trap in surrounding air formaldehyde on-Line Monitor Device provided by the embodiment of the utility model
Structure schematic diagram；
Fig. 4 is the structural representation of reaction kettle in surrounding air formaldehyde on-Line Monitor Device provided by the embodiment of the utility model
Figure；
In FIG. 1 to FIG. 4,1-can action pane；2-display screens；3-remove formaldehyde plant；4-three-way solenoid valves；5-
Grain object filtering head；6-condensing units；7-helix tube collecting traps；8-reaction kettles；9-air bubble eliminating devices；10-long the light of total reflection
The online flow cell of journey；11-light sources；12-photodetectors；13-insulating boxs；14-gas-liquid separation devices；15-drying tubes；
16-gas flowmeters；17-vacuum diaphragm pumps；18,19,20,21-be respectively the first~the 4th electromagnetic drive micro pump；22,
23-the first peristaltic pump, the second peristaltic pump；24-condensate water circulatories pump；25-temperature sensors；26-heating rods；27-heating
Piece；28-threeways；29-helix tubes；30-water-bath interlayers；31-gas-liquid separation chambers；32-reaction kettle shells；33-heat-insulated materials
Material；34-heat-conducting metals；35-four fluorine tubes；36-temperature sensors；37-heating rods.
Specific embodiment
With reference to the accompanying drawing, the utility model is further described by embodiment, but limitation is not originally practical in any way
Novel range.
The utility model provides a kind of on-Line Monitor Device of Formaldehyde Determination, is caught based on gas diffusion absorption
The wet chemistry method and absorption spectrum detection technique of collection are realized and carry out real-time online detection to surrounding air kind content of formaldehyde, can show
Content of formaldehyde in the on-line continuous monitoring surrounding air of field.The utility model is existed using the total reflection online flow cell solution of long light path
It is totally reflected multiple reflections in flow cell and absorbs light, the on-line monitoring of Formaldehyde Determination can be realized according to absorbance,
Improve detection sensitivity and detection limit.The utility model is provided to be circulated online using wet type gas diffusion trapping principle and long light path
The surrounding air formaldehyde on-Line Monitor Device of pool technology is precisely controlled micro solution using electromagnetic drive micro pump, and
Reduce daily maintenance.
Fig. 1 is the outside drawing of surrounding air formaldehyde on-Line Monitor Device provided by the embodiment of the utility model；Fig. 2 is shown
The composed structure of device.Formaldehyde Determination is monitored on-line using the device, is embodied as follows: by 15mL
Diluting concentrated sulfuric acid is configured to absorbing liquid to 5L, rocks uniformly；It is used by 385g ammonium acetate, 12.5mL glacial acetic acid and 10mL acetylacetone,2,4-pentanedione
Deionized water is diluted to 5L and is configured to derivative liquid and is protected from light, cryo-conservation, stands 12 hours.
When sampling, three-way solenoid valve 4 is switched to sampling configuration, and sample gas is directly over particulate matter filtering head 5 and removes particulate matter,
Under the action of vacuum diaphragm pump 17, by helix tube collecting trap 7, (Fig. 3 show the knot of helix tube collecting trap in the present embodiment
Structure), at the same absorbing liquid acted on while the first electromagnetic drive micro pump 18 and air-flow under enter helix tube in and in tube wall shape
At liquid film, formaldehyde components, which are absorbed, is transferred to liquid phase.Trapping temperature is controlled at 20 DEG C by water bath with thermostatic control.Air-flow passes through gas stream
It needs to remove moisture in gas by gas-liquid separation device 14 and drying tube 15 before meter 16 and air pump 17, damages flow to prevent hydrops
Meter and air pump, waste liquid are discharged by the second peristaltic pump 23.Liquid phase sample to be tested and derivative liquid are micro in the second electromagnetic drive respectively
By small-sized tetrafluoro threeway and mixed under the control action of pump 19 and third electromagnetic drive micro pump 20, after mixing sample to be tested into
Enter progress staining reaction (structure that Fig. 4 show reaction kettle in the present embodiment) in reaction kettle 8, reaction temperature is constant at 75 DEG C.
Into before detection module, sample to be tested is passed through micro bubbles removal device 9, the influence to avoid bubble to measurement.Remove bubble removing
Afterwards, sample to be tested is pushed into the total reflection online flow cell 10 of long light path by the 4th electromagnetic drive micro pump 21, in the specific of 415nm
Under light source 11, photodetector 12 detects the light signal strength of sample to be tested.Detection module temperature constant control is in 35 DEG C.
When marking zero, the incision of three-way solenoid valve 4 obtains zero gas except 3 channel of formaldehyde plant.Zero gas is filtered by particulate matter
First 3 removal particulate matter, under the action of vacuum diaphragm pump 17, by helix tube collecting trap 7, while absorbing liquid is driven in the first electromagnetism
Effect is lower while dynamic micro pump 18 and air-flow enters in helix tube.Air-flow is by passing sequentially through
It is discharged after gas-liquid separation device 14, drying tube 15, gas flowmeter 16 and air pump 17, waste liquid passes through the second peristaltic pump
23 discharges.Absorbing liquid and derivative liquid are made in the control of the second electromagnetic drive micro pump 19 and third electromagnetic drive micro pump 20 respectively
Entered in reaction kettle 8 with after lower mixing.After being passed through micro bubbles removal device 9 again, Zero calibration is carried out into detection module.Liquid
When mutually demarcating, in the same manner, it is dense that a series of gradients are separately arranged except 3 channel of formaldehyde plant is to obtain zero gas in the incision of three-way solenoid valve 4
The formalin of degree enters in helix tube under acting on while the first electromagnetic drive micro pump 18 and air-flow.Formalin and
Derivative liquid sequentially enters reaction module and detection module by identical control and reaction step, and last absorbance signal is detected.
It is identical when reaction module, detection module and all controls of solution conveyor module are with sampling when mark zero and calibration.
When cleaning, air pump 17 and first to fourth electromagnetic drive micro pump 18~21 stop working, and the first peristaltic pump 22 is opened
It opens, preparing mass concentration is the potassium hydroxide solution of 1mol/L as cleaning solution, and cleaning solution enters length under the action of peristaltic pump
Pipeline in cleaning detection cell is carried out in light path detection cell.
It should be noted that the purpose for publicizing and implementing example is to help to further understand the utility model, but this field
Technical staff be understood that and do not departing from the utility model and spirit and scope of the appended claims, various replacements and
Modification is all possible.Therefore, the utility model should not be limited to embodiment disclosure of that, the requires of the utility model protection
Range subject to the scope defined in the claims.
Claims (9)
1. a kind of on-Line Monitor Device of Formaldehyde Determination, including casing, sampling module, reaction module, detection mould
Block, solution conveyor module, control and data acquisition circuit and display screen；Wherein, sampling module, reaction module, detection module,
Solution conveyor module, control and data acquisition circuit and display screen are placed in casing, and display screen is embedded on casing；
The sampling module include sample lines, except formaldehyde plant, three-way solenoid valve, particulate matter filtering head, helix tube collecting trap,
Condensing unit, gas-liquid separation device, drying tube, gas flowmeter and vacuum diaphragm pump；The helix tube collecting trap uses glass
Pipe coiling thread-like structure, one end are the entrances of gas and liquid, and the other end is gas-liquid separation chamber；It is whole to use horminess glass tube
Cladding with enhancing structure and provides water-bath interlayer；Water-bath interlayer provides water bath with thermostatic control for collecting trap；
The reaction module includes mixing tee, reaction kettle and air bubble eliminating device；
The detection module includes micropore filtering film, the online flow cell of total reflection long light path, light source, photodetector and constant temperature
Case；
The solution conveyor module includes four electromagnetic drive micro pumps and two peristaltic pumps；
The control and data acquisition circuit include the main circuit board equipped with USB port, by main circuit board to the temperature of each module
Degree is controlled, is controlled solution conveyor module, and acquires and export each module temperature information and detection signal, signal number
It is exported according to from USB port；
Second electromagnetic drive micro pump of the rear end connection solution conveyor module of the helix tube collecting trap of sampling module, then by anti-
The reaction kettle of the mixing tee and reaction module of answering module connects；Reaction kettle is connected to air bubble eliminating device, air bubble eliminating device with it is molten
4th electromagnetic drive micro pump of liquid conveyor module connects, then accesses micropore filtering film, enters the total reflection of detection module later
The online flow cell of long light path；Absorbing liquid is connected by the first electromagnetic drive micro pump with sampling module, the second electromagnetic drive micro pump
Helix tube collecting trap is connected with the mixing tee of reaction module, third electromagnetic drive micro pump is by derivative liquid and reaction module
Mixing tee is connected, and the 4th electromagnetic drive micro pump is by the micropore filtering film phase of the air bubble eliminating device of reaction module and detection module
Even；First peristaltic pump is connected with the online flow cell of total reflection long light path in detection module；In second peristaltic pump and sampling module
Gas-liquid separation device rear end be connected；The control is connected with data acquisition circuit with display screen；
Sampling module converts liquid phase sample to be tested for the formaldehyde in air for sampling to the formaldehyde in surrounding air；
Reaction module for being dyed to liquid phase sample to be tested, make the liquid phase sample to be tested containing formaldehyde under constant high temperature with
2,4- pentanedione occurs derivative reaction and generates yellow sample to be tested DDL；
Solution conveyor module conveys cleaning solution and discharge waste liquid for accurately dispensing absorbing liquid, derivative liquid and component to be measured
Detection module is for detecting light signal strength；
Light signal strength is stored by control with data acquisition circuit conversion output for voltage signal data, and in display screen
Upper display.
2. the on-Line Monitor Device of Formaldehyde Determination as described in claim 1, characterized in that the casing uses aluminium
Prepared material carries out spray process using polytetrafluoro coating, to prevent acid solution corrosion.
3. the on-Line Monitor Device of Formaldehyde Determination as described in claim 1, characterized in that the casing sets display
Shield window and can action pane；It is described to place micro pump, peristaltic pump, helix tube collecting trap and micro porous filtration in action pane
Film, so as to the observation of daily maintenance and measurement process.
4. the on-Line Monitor Device of Formaldehyde Determination as described in claim 1, characterized in that the sampling module
In, the sample lines use 1/4 " tetrafluoro hard tube；Air sample is extracted using vacuum diaphragm pump, is passed through helix tube collecting trap
In；The dilution heat of sulfuric acid of helix tube collecting trap pH=5 is passed through as formaldehyde absorbent using 1/16 " four fluorine tube.
5. the on-Line Monitor Device of Formaldehyde Determination as described in claim 1, characterized in that the sampling module
In, helix tube collecting trap uses the glass tube of internal diameter 2mm, turns to the thread-like structure that diameter is 22mm；Condensing unit includes
Water circulating pump, cooling piece, small-sized water tank, fan, cooling fin and temperature sensor, and pass through silicone tube for water pump, water tank and spiral shell
Coil collecting trap external condensation water phase connects.
6. the on-Line Monitor Device of Formaldehyde Determination as described in claim 1, characterized in that the reaction module
In, derivative liquid and the solution to be measured for absorbing formaldehyde pass through mixing tee simultaneously and enter in reaction kettle, and the reaction kettle specifically uses
Length is that the four fluorine tube of 90cm is coiled on heat-conducting metal cylindrical body and is made, and built-in heating rod and temperature sensor are by reaction kettle
Temperature is controlled in 75 DEG C to accelerate derivative reaction.
7. the on-Line Monitor Device of Formaldehyde Determination as described in claim 1, characterized in that the air bubble eliminating device
For miniature air bubble eliminating device, using glass material.
8. the on-Line Monitor Device of Formaldehyde Determination as described in claim 1, characterized in that the detection module
In, the total reflection online flow cell of long light path include convex lens, the incision of optical path fluid path cross port, be totally reflected quartzy capillary column, light
Road fluid path cuts out bifurcated port and thermostat module；Light enters optical path fluid path after lens and cuts the port that crosses, and makes optical path and liquid
Road mixing；Flow cell is using the quartzy capillary column of total reflection；Optical path and fluid path cut out the outflow of bifurcated port through optical path fluid path；It is described
Light source uses the stabilization LED cool white light source of 415nm single wavelength.
9. the on-Line Monitor Device of Formaldehyde Determination as described in claim 1, characterized in that the detection module
In, light source and photodetector are placed in large capacity aluminum insulating box to keep the temperature stability of detection unit.
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| CN201920001991.3U CN209570499U (en) | 2019-01-02 | 2019-01-02 | The on-Line Monitor Device of Formaldehyde Determination |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109459401A (en) * | 2019-01-02 | 2019-03-12 | 北京大学 | The on-line monitoring method and device of Formaldehyde Determination |
| CN110926888A (en) * | 2019-12-10 | 2020-03-27 | 武汉羽芒智能科技有限公司 | Constant-temperature constant-current continuous automatic air sampler adaptable to low-temperature environment |
| CN115165765A (en) * | 2022-06-01 | 2022-10-11 | 广州伊创科技股份有限公司 | Air formaldehyde online detection method |
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2019
- 2019-01-02 CN CN201920001991.3U patent/CN209570499U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109459401A (en) * | 2019-01-02 | 2019-03-12 | 北京大学 | The on-line monitoring method and device of Formaldehyde Determination |
| CN110926888A (en) * | 2019-12-10 | 2020-03-27 | 武汉羽芒智能科技有限公司 | Constant-temperature constant-current continuous automatic air sampler adaptable to low-temperature environment |
| CN110926888B (en) * | 2019-12-10 | 2020-12-22 | 安徽风雷机械设备制造有限公司 | Constant-temperature constant-current continuous automatic air sampler adaptable to low-temperature environment |
| CN115165765A (en) * | 2022-06-01 | 2022-10-11 | 广州伊创科技股份有限公司 | Air formaldehyde online detection method |
| CN115165765B (en) * | 2022-06-01 | 2024-03-29 | 广州伊创科技股份有限公司 | Online detection method for air formaldehyde |
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